Process to extract liquid dielectric coolant from the sesame oil

ABSTRACT

The present invention provides a process to extract liquid dielectric coolant from the sesame oil, which is suitable for both power frequency and high frequency electrical applications. The process comprises the steps of, processing the refined, bleached and deodorised sesame seed oil with an alkali to remove the fatty acids. After processing the sesame seed oil, at step, the processed sesame seed oil is blended with a Sodium Hydroxide (NaOH) solution. The blended sesame oil forms a top layer and a bottom layer within short duration of time. At step, the top layer is extracted and is water washed and filtered. At step, the top layer sesame seed oil is mixed the Tert Butyl Hydroxy Quinone solution. Finally, at step, the mixture of filtered top layer and Tert Butyl Hydroxy Quinone solution is heated to extract the liquid dielectric coolant.

TECHNICAL FIELD OF THE INVENTION

The present invention relates to a process to extract liquid dielectriccoolant from sesame oil, which is suitable for both power frequency andhigh frequency electrical applications.

BACKGROUND OF THE INVENTION

Liquid dielectric coolant plays a dual role as an insulating mediumbetween the energized parts and as well as a coolant in the performanceof electrical equipments particularly in power distributiontransformers, high frequency and high voltage transformers and inelectrical apparatus or appliances. The mineral oil and silicone fluidare the most common liquid dielectric coolants used in power frequencytransformers and high frequency transformers. The performance of theliquid dielectric coolant or liquid insulation has been evaluated forits electrical, physical, chemical and thermal properties by consideringvarious factors such as high breakdown strength, good oxidationstability or good ageing resistance, high flash point, low viscosity,good thermal conductivity for good heat dissipation, good compatibilitywith solid insulating materials/other materials used in electricaltransformers, low dissipation factor, etc. The liquid dielectricstrength defines the ability to resist electric breaks at certainfrequencies of electrical power. The liquid dielectric strength ismeasured as the minimum electric voltage, which is required forformation of an arc between two electrodes. Recent developments in theformation of liquid insulation have led to the development of a processto extract liquid dielectric coolant from the sesame oil, which issuitable for both power frequency and high frequency electricalapplications.

Various types of conventional liquid dielectric coolants are known inthe prior art, wherein most of them uses mineral oil and silicone fluidas liquid insulation in power frequency transformers and in the highfrequency transformers. Typically, the conventional methods use mineraloil composition for power frequency applications. The liquid dielectriccoolant of the mineral oil has relatively high value of breakdownvoltage for power frequency applications. However, the use of mineraloil composition as a liquid insulation does not provide support for highfrequency applications, as the breakdown voltage strength drops by onethird at hundred kHz (Kilo Hertz) and also the liquid insulation of themineral oil has low flash point and is non-biodegradable.

Conventional methods use the silicone fluid as a liquid insulation forhigh frequency applications. The liquid dielectric coolant of thesilicone fluid operates at higher temperature for high frequencyapplications. However, the use of silicone fluid as a liquid insulationdoes not provide support for power frequency applications due to fastdegradation by corona effect.

Hence, there is a need for a process to extract liquid dielectriccoolant, which is suitable for both power frequency and high frequencyelectrical applications.

SUMMARY OF THE INVENTION

The present invention overcomes the drawbacks in the prior art andprovides a process to extract liquid dielectric coolant from the sesameoil using limited composition, which is suitable for both powerfrequency and high frequency electrical applications. In most preferredembodiment, the process includes the step of processing the refined,bleached and deodorised sesame seed oil with an alkali to remove thefatty acids therein. After processing the sesame seed oil, the processedsesame seed oil is blended with a Sodium Hydroxide (NaOH) solution,wherein the blended sesame oil forms a top layer and a bottom layerwithin a short duration of time. After the formation of top layer in thesesame seed oil, the top layer is extracted and is water washed andfiltered. After the filtration process of the top layer, the top layersesame seed oil is mixed the Tert Butyl Hydroxy Quinone solution.Finally, the mixture of filtered top layer and the Tert Butyl HydroxyQuinone solution is heated to extract the liquid dielectric coolant fromthe sesame seed oil.

In a preferred embodiment of the invention, the extracted liquiddielectric coolant has a dielectric strength of at least 45 KV.

In a preferred embodiment of the invention, the liquid dielectriccoolant has a power frequency dissipation factor of 0.0013 at roomtemperature and 0.0307 at 90 degree Celsius temperature for powerfrequency

In a preferred embodiment of the invention, the liquid dielectriccoolant at room temperature has high frequency dissipation factorsranging from 0.00015-0.0023 at frequency ranging from 5 kHz-500 kHz andat 90 degree Celsius temperature the dissipation factor ranges from0.00058-0.00053 at frequency ranging from 5 kHz-500 kHz.

In a another embodiment of the invention, the sesame seed oil is blendedwith an rice bran oil to obtain the liquid dielectric coolant, whereinthe blending ratio of sesame seed oil and rice bran oil is at least oneof, 50:50, 70:30, or 30:70.

The prior arts use the mineral oil and silicone fluid as liquiddielectric coolants for power frequency and high frequency electricalapplications. The use of the mineral oil and silicone fluid as liquiddielectric coolants includes various draw backs such as beingnon-biodegradable, being non eco-friendly, having relatively low flashpoint, non-renewable. Minor ingredients or aromatic compounds aresuspected to be carcinogenic, fast degradation due to corona, expensive,etc.

The present invention overcomes draw backs in the prior arts as theliquid dielectric coolant is extracted from the sesame oil. The liquiddielectric coolant from the sesame oil has various features such asrenewable resources, edible, biocompatible, eco-friendly, highlybiodegradable, abundantly available in nature, requires limitedcomposition for its extraction, high flash point, etc.

The process is easy to implement, simple and is more suitable forapplications in transformer lubricants, electrical appliances,automotive lubricants, gear cutting oil, turbine oil, hydraulic oil andmetal forming oil as well as general purpose lubricant.

It is to be understood that both the foregoing general description andthe following details description are exemplary and explanatory and areintended to provide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other features of embodiments will become moreapparent from the following detailed description of embodiments whenread in conjunction with the accompanying drawings. In the drawings,like reference numerals refer to like elements.

FIG. 1 illustrates a process flow for extracting the liquid dielectriccoolant from the sesame oil, according to one embodiment of theinvention.

FIG. 2 illustrates the table representing power frequency dissipationfactors of the conventional liquid dielectric coolant of a biotemp.

FIG. 3 illustrates the table representing power frequency dissipationfactors of the conventional liquid dielectric coolant of an envirotemp.

FIG. 4 illustrates the table representing high frequency dissipationfactors of the conventional liquid dielectric coolant of silicone fluid.

FIG. 5 illustrates the table representing a relative permittivity of theconventional liquid dielectric coolants of the mineral oil and siliconefluid.

FIG. 6 illustrates the table representing a kinematic viscosity of theconventional liquid dielectric coolants of the biotemp and envirotemp.

FIG. 7 illustrates the table representing power frequency dissipationfactors of the liquid dielectric coolant of sesame seed oil, accordingto one embodiment of the invention.

FIG. 8 illustrates the table representing high frequency dissipationfactors of the liquid dielectric coolant of sesame seed oil, accordingto one embodiment of the invention.

FIG. 9 illustrates the table representing the relative permittivity ofthe liquid dielectric coolant of the sesame seed oil, according to oneembodiment of the invention.

FIG. 10 illustrates the table representing a kinematic viscosity of theliquid dielectric coolant of the sesame seed oil, according to oneembodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

Reference will now be made in detail to the description of the presentsubject matter, one or more examples of which are shown in figures. Eachembodiment is provided to explain the subject matter and not alimitation. These embodiments are described in sufficient detail toenable a person skilled in the art to practice the invention, and it isto be understood that other embodiments may be utilized and thatlogical, physical, and other changes may be made within the scope of theembodiments. The following detailed description is, therefore, not betaken as limiting the scope of the invention, but instead the inventionis to be defined by the appended claims.

The term “biotemp and envirotemp” as claimed in the embodiments refersto the mineral oil.

The prior arts use the mineral oil and silicone fluid as liquiddielectric coolants for power frequency and high frequency electricalapplications. The use of the mineral oil and silicone fluid as liquiddielectric coolants includes various draw backs such as beingnon-biodegradable, being non eco-friendly, having relatively low flashpoint, non-renewable. Minor ingredients or aromatic compounds aresuspected to be carcinogenic, fast degradation due to corona, expensive,etc.

The present invention overcomes draw backs in the prior arts as theliquid dielectric coolant is extracted from the sesame oil. The liquiddielectric coolant from the sesame oil has various features such asrenewable resources, edible, biocompatible, eco-friendly, highlybiodegradable, abundantly available in nature, requires limitedcomposition for its extraction, high flash point, etc.

FIG. 1 illustrates a process flow for extracting the liquid dielectriccoolant from the sesame oil, according to one embodiment of theinvention. In the preferred embodiment, the process 100 comprises thesteps of, processing the commercially available refined, bleached anddeodorized sesame oil with an alkali to remove the fatty acids. Afterremoving the fatty acids in the sesame oil, at step 102, the processedsesame oil is blended with a Sodium Hydroxide (NaOH) solution. Theamount of NaOH solution that is blended with the sesame seed oil is 10percent of the total weight of the sesame seed oil. The blended sesameoil is allowed to settle for a short duration of time. During the shortduration of time, the blended sesame oil forms a top layer and a bottomlayer. After the formation of the top layer and the bottom layer, atstep 103, the top layer of the blended sesame oil is extracted. Theextracted top layer is water washed and filtered. After the filtrationof the top layer, at step 104, the filtered top layer is mixed with aTert Butyl Hydroxy Quinone solution. The amount of Tert Butyl HydroxyQuinone solution that is mixed with the filtered top layer of sesameseed oil is at least 0.75 percent of the total weight of the filteredsesame oil. Finally, at step 105, the mixture of filtered top layer andthe Tert Butyl Hydroxy Quinone solution is heated up to 150 degreeCelsius for four hours to extract the liquid dielectric coolant.

FIG. 2 illustrates the table representing power frequency dissipationfactors of the conventional liquid dielectric coolant of a biotemp. Thetable indicates the power frequency dissipation factors of theconventional liquid dielectric coolant of a biotemp at room temperatureand at higher temperature. The liquid dielectric coolant has powerfrequency dissipation factors of 0.0015 at room temperature and 0.02 at100 degree Celsius temperature for power frequency.

FIG. 3 illustrates the table representing power frequency dissipationfactors of the conventional liquid dielectric coolant of an envirotemp.The table indicates the power frequency dissipation factors at roomtemperature and at higher temperature. The liquid dielectric coolant haspower frequency dissipation factors of 0.0001-0.0015 at room temperatureand 0.02 at 90 degree Celsius temperature for power frequency.

FIG. 4 illustrates the table representing high frequency dissipationfactors of the conventional liquid dielectric coolant of silicone fluid.The table indicates the high frequency dissipation factors of theconventional liquid dielectric coolant of a biotemp at room temperatureand at higher temperature. The liquid dielectric coolant has a highfrequency dissipation factors of 0.00009 at 5 kHz of room temperature,0.0004 at 100 kHz of room temperature, 0.0009 at 250 kHz of roomtemperature, 0.0018 at 500 kHz of room temperature, 0.00003 at 5 kHz of90 degree Celsius temperature, 0.001 at 100 kHz of 90 degree Celsiustemperature, 0.002 at 250 kHz of 90 degree Celsius temperature and 0.03at 500 kHz of 90 degree Celsius temperature.

FIG. 5 illustrates the table representing a relative permittivity of theconventional liquid dielectric coolants of the mineral oil and siliconefluid. The liquid dielectric coolant of the mineral oil has the relativepermittivity of 2.1 for power frequency applications. The relativepermittivity of the silicone fluid is 2.7 for high frequencyapplications.

FIG. 6 illustrates the table representing a kinematic viscosity of theconventional liquid dielectric coolants of the biotemp and envirotemp.The table indicates the kinematic viscosity at 100° C. Centistokes cSt.The liquid dielectric coolant of the biotemp has the kinematic viscosityof 9.3 cSt at 100 degree Celsius. The kinematic viscosity of theenvirotemp ranges from 7.7-8.3 Centistokes (cSt) at 100 degree Celsius.

FIG. 7 illustrates the table representing power frequency dissipationfactors of the liquid dielectric coolant of sesame seed oil, accordingto one embodiment of the invention. In the preferred embodiment, thetable indicates the power frequency dissipation factors at roomtemperature and at higher temperature. The liquid dielectric coolant hasa power frequency dissipation factor of 0.0013 at room temperature and0.0307 at 90 degree Celsius temperature for power frequency. The powerfrequency dissipation factors of the sesame seed oil are reasonably goodwhen compared to the conventional envirotemp and biotemp oils.

FIG. 8 illustrates the table representing high frequency dissipationfactors of the liquid dielectric coolant of sesame seed oil, accordingto one embodiment of the invention. In the preferred embodiment, thetable indicates the high frequency dissipation factors at roomtemperature and at higher temperature. The liquid dielectric coolant hasa high frequency dissipation factors of 0.00015 at 5 kHz of roomtemperature, 0.00034 at 100 kHz of room temperature, 0.00112 at 250 kHzof room temperature, 0.0023 at 500 kHz of room temperature, 0.00058 at 5kHz of 90 degree Celsius temperature, 0.0005 at 100 kHz of 90 degreeCelsius temperature, 0.00009 at 250 kHz of 90 degree Celsius temperatureand 0.00053 at 500 kHz of 90 degree Celsius temperature. The highfrequency dissipation factors of the sesame seed oil are very good whencompared to the conventional silicone fluid.

FIG. 9 illustrates the table representing the relative permittivity ofthe liquid dielectric coolant of the sesame seed oil, according to oneembodiment of the invention. In the preferred embodiment, the liquiddielectric coolant has a relative permittivity of 2.7 to 3.1 for bothpower frequency and for high frequency. The relative permittivity of thesesame seed oil is much better when compared to the conventionalsilicone fluid and mineral oil.

FIG. 10 illustrates the table representing a kinematic viscosity of theliquid dielectric coolant of the sesame seed oil, according to oneembodiment of the invention. In the preferred embodiment, the liquiddielectric coolant has a viscosity of 9.3 Centistokes (cSt) at 100degree Celsius. The kinematic viscosity of the sesame seed oil is muchbetter when compared to the conventional biotemp and envirotemp.

In the preferred embodiment, the extracted liquid dielectric coolant hasa dielectric strength of 45 KV.

In further embodiment, the sesame seed oil is blended with a rice branoil to obtain the liquid dielectric coolant using preceding steps. Theblending ratios are 50 percent of sesame seed oil and 50 percent of ricebran oil, 70 percent of sesame seed oil and 30 percent of rice bran oiland 30 percent of sesame seed oil and 70 percent of rice bran oil.

The prior arts use the mineral oil and silicone fluid as liquiddielectric coolants for power frequency and high frequency electricalapplications. The use of the mineral oil and silicone fluid as liquiddielectric coolants includes various draw backs such as beingnon-biodegradable, being non eco-friendly, having relatively low flashpoint, non-renewable. Minor ingredients or aromatic compounds aresuspected to be carcinogenic, fast degradation due to corona, expensive,etc.

The present invention overcomes draw backs in the prior arts as theliquid dielectric coolant is extracted from the sesame oil. The liquiddielectric coolant from the sesame oil has various features such asrenewable resources, edible, biocompatible, eco-friendly, highlybiodegradable, abundantly available in nature, requires limitedcomposition for its extraction, high flash point, etc.

The process is easy to implement and simple and is more suitable forapplications in transformer lubricants, electrical appliances,automotive lubricants, gear cutting oil, turbine oil, hydraulic oil andmetal forming oil as well as general purpose lubricant applications.

It is to be understood, however, that even though numerouscharacteristics and advantages of the present invention have been setforth in the foregoing description, together with details of thestructure and function of the invention, the disclosure is illustrativeonly. Changes may be made in the details, especially in matters ofshape, size, and arrangement of parts within the principles of theinvention to the full extent indicated by the broad general meaning ofthe terms in which the appended claims are expressed.

We claim:
 1. A process to extract liquid dielectric coolant from sesameoil, the process comprises the steps of: a. blending refined, bleachedand deodorised sesame seed oil with an Sodium Hydroxide (NaOH) alkali toremove the fatty acids therein, wherein the blended sesame oil forms atop layer and a bottom layer; b. extracting the top layer of the blendedsesame seed oil, wherein the extracted top oil layer is water washed andfiltered; c. mixing the filtered sesame oil with a tert butyl hydroxyquinone and d. heating the mixture to eliminate moisture to realise theliquid dielectric coolant.
 2. The process as claimed in claim 1, whereinan amount of NaOH solution that is blended with the sesame seed oil isat least 10 percent of the total weight of the sesame seed oil.
 3. Theprocess as claimed in claim 1, an amount of tert butyl hydroxy quinonesolution that is mixed with the filtered top layer of sesame seed oil isat least 0.75 percent of the total weight of the filtered sesame oil. 4.The process as claimed in claim 1, wherein the extracted liquiddielectric coolant has a breakdown voltage of at least 45 KV.
 5. Theprocess as claimed in claim 1, wherein the liquid dielectric coolant haspower frequency dissipation factors of 0.0013 at room temperature and0.0307 at 90 degree Celsius.
 6. The process as claimed in claim 1,wherein the liquid dielectric coolant has a high frequency (5 kHz-500kHz) dissipation factors ranging from 0.00015-0.0023 at room temperatureand 0.00058-0.00053 at 90 degree Celsius.
 7. The process as claimed inclaim 1, wherein the liquid dielectric coolant has a relativepermittivity of 2.7 to 3.1 for both power frequency (50 Hz) and highfrequency (5 kHz-500 kHz).
 8. The process as claimed in claim 1, whereinthe liquid dielectric coolant has a kinematic viscosity of 9.3centistokes (cSt) at 100 degree Celsius.